Hi David,
I'm about as rusty on recalling ID on regulation pattern military sabres as these swords themselves
but off the cuff and without hitting the books (too tired for another excavation in the bookmobile) I would say the top one with fluted ivory appears to be American officers. The pommel resembles earlier French officers swords also, along with the fluted langet. Looks early 19th, for U.S.......Federal period.
The second example seems Continental European officers, probably latter 18th c. into early 19th, the langet seems Prussian or Austrian. Admittedly just guesses, but think the time frames.
Best regards,
Jim